I used this hammock for a while that's designed for the seats folded up and the load floor down, and it fit perfectly worked well.
However, we recently switched over to a soft sided folding crate that fits perfectly on the 60% side of the load floor and wedges behind the passenger seat when it's opened up so it doesn't move. The top and one side unzip so our dog can still see out the window, but if he's being too much of a pest I can zip up the top and he can't poke at us. It also helps keep all the dirt and grass out of the rest of the truck, and I'm not having to untangle him from his seatbelt (never drive with an unsecured animal) every time I stop. It also means I got the 40% side of the seat back to put other things on.
It's the 36" size. We bought ours at Scheels in Colorado Springs, but it seems to be available other places as well.
Canine Camper™ Tent Crates have a versatile design perfect for both indoor and outdoor use. With a strong steel frame, your pet will stay secure whether camping or making a short drive.
www.midwesthomes4pets.com